CN103498096A - Non-oriented electrical steel with excellent magnetic performance and Rm not smaller than 600 MPa - Google Patents
Non-oriented electrical steel with excellent magnetic performance and Rm not smaller than 600 MPa Download PDFInfo
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Abstract
The invention discloses non-oriented electrical steel with excellent magnetic performance and Rm not smaller than 600 MPa, wherein the non-oriented electrical steel is composed of the following components by weight percent: 2.5-3.5% of Si, 0.1-1.0% of Mn, not more than 1.0% of Ni and Al, not larger than 0.005% of N, not larger than 0.015% of S, not larger than 0.003% of C and not larger than 0.05% of P; the production steps are as follows: smelting and continuously casting a bloom; heating the continuously cast bloom; hot rolling; coiling; normalizing; pickling and cold rolling; continuous annealing; and naturally cooling to the room temperature for future use. The mechanical properties and magnetic performance of the non-oriented electrical steel disclosed by the invention can simultaneously satisfy the requirements of motor steel, namely, Rm is not smaller than 600 MPa, Rel is not smaller than 500 MPa, P1.0/400 is not larger than 17 W/kg, B 5000 is not smaller than 1.66 T, and stators and rotors are processed by the same electromagnetic steel plate to reduce the time and material costs.
Description
Technical field
The present invention relates to a kind of non-oriented electrical steel and production method thereof, belong to particularly fine magnetic property non-oriented electrical steel and the production method thereof of a kind of Rm >=600MPa.
Background technology
The global environment problem becomes increasingly conspicuous in recent years, and a lot of energy-saving field are all being advocated energy-conserving product, environment reply technology development, and automotive field is no exception, and low emission reduces the fuel consumption technology and has obtained rapid progress.And electromobile and field of hybrid electric vehicles are examples very outstanding in the energy-saving and emission-reduction field, the performance of automobile drive electric motor directly has influence on the performance of these electromobiles.
The drive-motor iron core is used permanent magnet more, and stator forms together with rotor.Recently, the ipm motor that permanent magnet is embedded to internal rotor is used widely, it makes any regulating rotary rotor speed become possibility, make the oriented high speed development of rotor, and in rotor high-speed when rotation, is due to the effect of centrifugal force, can cause the permanent magnet embedded to come off, impact is produced and device security, and this mechanical property to rotor material has proposed very high requirement.Particularly obtain rotor shapes when very complicated when ipm motor, must consider the stress concentration of rotor material, the requirement of the mechanical propertys such as centrifugal force and STRESS VARIATION.And, robot, engineering machinery machine field from now on may trend that high speed rotating occur the same as electric drive motor.
Rotor is with in all characteristics of non-oriented electromagnetic steel sheet, and primary is mechanical characteristics, i.e. yield strength and tensile strength, and this is to produce distortion when suppressing the rotor high-speed rotation, and the fatigure failure that causes of STRESS VARIATION.Electromobile in recent years, the mean stress that the hybrid power automobile drive electric motor rotor is subject to reaches 250MPa, and stress amplitude reaches 150MPa.Therefore, from suppressing the viewpoint of distortion, more than at least will reaching 400 MPa, consider that the safety problem yield strength is even proper more than 500MPa.And, from suppressing the viewpoint of the fatigure failure that above-mentioned stressed condition produces, more than tensile strength at least will reach 500MPa, consider that safety problem tensile strength is even proper more than 600MPa.
Rotor is exactly magneticflux-density by the second characteristic of non-oriented electromagnetic steel sheet.Ipm motor takes full advantage of reluctance torque, and rotor directly has influence on the size of torque by the magneticflux-density of material, and magneticflux-density is low can't obtain desirable torque.
Be exactly the 3rd characteristic iron loss of non-oriented electromagnetic steel sheet for rotor, iron loss is that irreversible the domain wall motion magnetic hysteresis loss caused and the eddy-current loss that magnetization causes form, total the total loss of electrical sheet are by the incompatible evaluation of these two kinds of losses.The loss that rotor produces does not have too much influence to the efficiency of motor, and heating when rotor produces loss has the effect of demagnetization to permanent magnet, indirectly worsened the performance of motor.Therefore, the heat resisting temperature that rotor can demagnetize corresponding according to the permanent magnetism body heat by the iron loss level of non-oriented electromagnetic steel sheet determines.The material used compared with stator, rotor is with slightly high can the acceptance of iron loss of non-oriented electromagnetic steel sheet.This is that iron loss is mainly produced by stator core, particularly stator tooth because the magnetic fluctuation component in motor mainly concentrates on stator core.In rotor core and permanent magnet, change in magnetic flux density is less, and in stator core, change in magnetic flux density is larger.Therefore with respect to the stator core loss, the loss in rotor and permanent magnet can be ignored.And can estimate from harmonic reduction, the harmonic component amplitude in rotor is very little, and the iron loss in stator can be much larger than rotor.
In recent years, along with the prices of raw and semifnished materials go up, electromechanics trade wishes to improve the yield rate of steel, reduces material cost and reduces technical process, wishes that stator and rotor adopt the same electro-magnetic steel plate to reduce costs to reduce technical process for this reason.Stator rotor processing is integrated is exactly that stator strikes out rotor with material at the complete rear discarded middle part surplus material of punching press.Therefore the yield rate of material significantly improves.
Yet the electro-magnetic steel plate that rotor is used will be paid the utmost attention to intensity rather than magnetic property, the electro-magnetic steel plate used compared with stator allows that iron loss is higher.The electro-magnetic steel plate that high rotating speed drive-motor rotor is used must meet necessary intensity, and stator is processed together with material with rotor, possibly can't obtain necessary stator magnet performance, thereby can't obtain desirable electrical efficiency, and this is the problem that will consider.On the other hand, stator is original just not high to the requirement of strength of member, must preferentially meet necessary magnetic property, and stator is processed together with rotor material like this, just possibly can't meet necessary strength level, produces fatigure failure, and this is also a problem.
Therefore, electro-magnetic steel plate must have both simultaneously manufactures the necessary intensity of high speed rotating rotor, manufactures the necessary magnetic property of stator, thereby rotor-stator adopts the same electro-magnetic steel plate to be processed reduction time and materials cost, is that the user wishes the target realized.
Usually the means that reduce iron loss comprise that adding suitable alloying element promotes the recrystallized structure prosperity, perhaps adopt suitable process means to obtain enough large finished product grain-size, thereby reduction magnetic hysteresis loss, but after adding, a lot of alloying elements can reduce magnetic induction on the one hand, and then cause motor torque to descend, reduced product intensity on the other hand when promoting the recrystallized structure prosperity, and adopt suitable process means to obtain enough large finished product grain-size, also can make product intensity reduce.Japanese Patent Laid-Open 2010-24509 discloses a kind of intensity of Nippon Steel's exploitation and the non-oriented electromagnetic steel sheet had excellent magnetic characteristics, pass through Ni, Cu interpolation according to a certain percentage reaches the effect that improves magnetic property magnetic strength and intensity, its Al content can reach more than 3.0%, Cu can separate out tiny ε-Cu Second Phase Particles in course of hot rolling, can hinder growing up of crystal grain in recrystallization process, worsen magnetic property, in molten steel, Al content is high, easy dross during casting, casting billet surface easily scabs, the finished surface defect is many, Al also easily produces internal oxidation layer and interior nitride layer when annealing, this patent has also been added the Sn of 0.01%-0.10% in addition, the fusing point of Sn is lower, easily at surface of steel plate, produce dross in annealing process, and add and also increased cost of alloy.Finally this patent has only provided yield strength, the data of unit elongation and eddy-current loss, and not mentioning total loss and magnetic strength level. Japanese Patent Laid-Open 2011-89204 discloses the manufacture method of a kind of rotor of Sumitomo Metal Industries' exploitations with non-oriented electromagnetic steel sheet, it is by adding Nb, the a large amount of tiny Nb (C separated out in course of hot rolling, N) particle is controlled the recrystallize ratio in annealing process, thereby reach the effect of precipitation strength, its 0.35mm finished product yield strength reaches 659MPa, tensile strength reaches 768MPa, but the too low meeting of recrystallize ratio causes magnetic property to worsen, especially iron loss significantly rises, its 0.35mm finished product high frequency iron loss P
1.0/400up to 46W/kg, so it is only suitable for manufacturing rotor material.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of mechanical property and magnetic property can meet the requirement of motor with steel, 0.35mm thickness steel plate performance: Rm>=600MPa, Rel>=500MPa, P simultaneously
1.0/400≤ 17 W/kg, B
5000>=1.66T, the non-oriented electrical steel and the production method thereof that make stator and rotor adopt the same electro-magnetic steel plate to be processed.
Realize the measure of above-mentioned purpose:
The fine magnetic property non-oriented electrical steel of Rm>=600MPa, its component and weight percent content are: Si:2.5～3.5%, Mn:0.1～1.0%, Ni+Al is no more than 1.0%, N :≤0.005%, S≤0.015%, C≤0.003%, P≤0.05%, all the other are iron and residual content; And meet: 1.0≤Al/Ni≤2.0, C+S+N≤0.007; 0.35mm the mechanical property of thickness finished product: Rm>=600MPa, Rel>=500MPa, magnetic property: P
1.0/400≤ 17 W/kg, B
5000>=1.66T.
Produce the method for the fine magnetic property non-oriented electrical steel of Rm >=600MPa, its step:
1) smelt also continuous casting and become base;
2) to the continuously cast bloom heating, temperature is not less than 1050 ℃, and time inside furnace is not less than 120 minutes;
3) carry out hot rolling: control the roughing finishing temperature and be not less than 900 ℃, steel plate thickness is not less than 25mm; Control the finish rolling finishing temperature and be not less than 750 ℃, thickness of slab is not less than 2.0mm;
4) batched, control coiling temperature and be not less than 700 ℃;
5) carry out normalizing, control the normalizing furnace soaking temperature and be not less than 750 ℃, the normalizing time is no less than 1 minute;
6) carry out pickling cold rolling: pickling temperature 60-100 ℃, pickling time 2 ~ 5 minutes, adopt the once cold rolling method to carry out cold rolling, and rolling pass is 4 ~ 7, and the total reduction of controlling front 3 ~ 6 passages is not less than 80%, and extreme trace time draft is no more than 20%;
7) carry out continuous annealing, annealing temperature is not less than 850 ℃, and soaking time is no less than 1 minute, and atmosphere is conventional H
2+ N
2gas mixture, N
2/ H
2be no more than 0.5, gas flow is not less than 200m
3/ min;
8) naturally cool to room temperature, stand-by.
The present invention has added a small amount of Ni, replaces part Al, and its effect is as follows:
(1) Ni is ferromagnetic element, when externally-applied magnetic field, is easy to make material to reach capacity, thereby improves the magnetic strength of material, and Al can reduce saturated magnetic strength.
(2) high grade non-oriented silicon steel does not have phase transformation (at ferrite area) when thermal distortion, stacking fault energy is high, during distortion, the width of extended dislocation is narrow, boundling is easy, the friendship slippage of dislocation and climb and easily carry out, dislocation easily shifts between slip plane, and unlike dislocation is cancelled out each other, and result descends dislocation desity, distortional strain energy reduces, and is not enough to reach the required energy level of dynamic recrystallization.Therefore this metalloid is in the pyroplastic deformation process, even deformation extent is very large, texturing temperature is far above the temperature of Static Recrystallization, dynamic recovery also only occurs, and dynamic recrystallization does not occur, that is to say, dynamic recovery is unique softening mechanism in high stacking fault energy Formed During Metal Hot Deformation.Add stacking fault energy after Ni to reduce, during distortion, the width of extended dislocation broadens, boundling becomes difficulty, the friendship slippage of dislocation and climb and be difficult to carry out, dislocation is difficult to shift between slip plane, result rises dislocation desity, and distortional strain energy raises, and dynamic recrystallization more easily occurs.And Al belongs to the raising stacking fault energy, be unfavorable for the generation of dynamic recrystallization, the ability of dynamic recrystallization is except outside the Pass the stacking fault energy with metal just has, also relevant with the difficulty or ease of crystal boundary migration in addition.The tiny AlN particle that Al separates out in course of hot rolling can hinder the movement of crystal boundary, so can contain the carrying out of dynamic recrystallization.In addition, in molten steel, Al content is high, easy dross during casting, and casting billet surface easily scabs, the finished surface defect is many, Al also easily produces internal oxidation layer and interior nitride layer when annealing, and therefore the silicon steel recrystallized structure with Ni replacement Al is flourishing and perfect (as accompanying drawing 1, Fig. 2), be conducive to improve magnetic, the magnetic property fluctuation range is little, the Reduced susceptibility to finished product annealing process, good stability, and technique is adaptable, and surface quality is improved.
(3) enlarged the γ phase region, phase point temperature Ar adding of Ni
3relative reduce, finishing temperature easily approaches Ar
3point, at the time shorten of α single phase region finish rolling, thereby make that the inner recrystallized structure of hot-rolled sheet is flourishing, deformation is brilliant less, equiax crystal is many, proportion of equiaxed grain is high, transitional zone and the prosperity of shear band in tissue after cold rolling, deformed belt is few, because transitional zone and shear band are { 100}, { the forming core place of the favorable textures such as 110}, deformed belt is the { nucleation site of the unfavorable texture such as 111}, therefore, { 100}, { the favorable texture prosperity such as 110} after annealing, { the unfavorable texture such as 111} is weakened, and magnetic significantly improves.
(4) the Ni atom dissolved in matrix causes lattice distortion, lattice distortion has increased the resistance of dislocation motion, solute atoms enrichment on the fault face can reduce stacking fault energy and increase the width of expanding dislocation on the other hand, the expansion dislocation is difficult for constriction, the intersection of dislocation difficulty, dual friendship slippage and cutting dislocation difficulty, be difficult for producing the polyphyly slippage, thereby make the strength increase of material.
(5) Ni is the simple substance atom, can not form inclusion or form Second Phase Precipitation in course of hot rolling with other elements, thereby can not worsen finished product recrystallized structure.
(6) resistivity of Ni is lower than Al, and Substitute For Partial Al backwash loss meeting is risen to some extent; In addition, excessive Ni becomes fragile steel plate, when cold rolling, easily rupture, so the interpolation of Ni also should be appropriate.
Compared with prior art, mechanical property and magnetic property can meet the requirement of steel for motor simultaneously in the present invention, i.e. Rm>=600MPa, Rel>=500MPa, P
1.0/400≤ 17 W/kg, B
5000>=1.66T, make rotor-stator adopt the same electro-magnetic steel plate to be processed, thereby reduce the time and materials cost.
The accompanying drawing explanation
Fig. 1 is the typical gold phase constitution figure after Hot Rolled Plate Normalizing of the present invention;
Fig. 2 is the typical gold phase constitution figure after finished products of the present invention.
Embodiment
Below the present invention is described in detail:
The value list that table 1 is various embodiments of the present invention and Comparative Examples;
The main technologic parameters list that table 2 is various embodiments of the present invention and Comparative Examples;
Table 3 is various embodiments of the present invention and the list of Comparative Examples Performance Detection situation.
Various embodiments of the present invention are according to following steps production:
1) smelt also continuous casting and become base;
2) to the continuously cast bloom heating, temperature is not less than 1050 ℃, and time inside furnace is not less than 120 minutes;
3) carry out hot rolling: control the roughing finishing temperature and be not less than 900 ℃, steel plate thickness is not less than 25mm; Control the finish rolling finishing temperature and be not less than 750 ℃, thickness of slab is not less than 2.0mm;
4) batched, control coiling temperature and be not less than 700 ℃;
5) carry out normalizing, control the normalizing furnace soaking temperature and be not less than 750 ℃, the normalizing time is no less than 1 minute;
6) carry out pickling cold rolling: pickling temperature 60-100 ℃, pickling time 2 ~ 5 minutes, adopt the once cold rolling method to carry out cold rolling, and rolling pass is 4 ~ 7, and the total reduction of controlling front 3 ~ 6 passages is not less than 80%, and extreme trace time draft is no more than 20%;
7) carry out continuous annealing, annealing temperature is not less than 850 ℃, and soaking time is no less than 1 minute, and atmosphere is conventional H
2+ N
2gas mixture, N
2/ H
2be no more than 0.5, gas flow is not less than 200m
3/ min;
8) naturally cool to room temperature, stand-by.
Table 1 various embodiments of the present invention and Comparative Examples chemical composition
Table 2 various embodiments of the present invention and Comparative Examples processing parameter list ()
Table 2 various embodiments of the present invention and Comparative Examples processing parameter list (two)
Table 2 various embodiments of the present invention and Comparative Examples processing parameter list (three)
Table 3 various embodiments of the present invention and Comparative Examples magnetic property and mechanical property list
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (2)
1.Rm the fine magnetic property non-oriented electrical steel of>=600MPa, its component and weight percent content are: Si:2.5～3.5%, Mn:0.1～1.0%, Ni+Al is no more than 1.0%, N :≤0.005%, S≤0.015%, C≤0.003%, P≤0.05%, all the other are iron and residual content; And meet: 1.0≤Al/Ni≤2.0, C+S+N≤0.007; 0.35mm the mechanical property of thickness finished product: Rm>=600MPa, Rel>=500MPa, magnetic property: P
1.0/400≤ 17 W/kg, B
5000>=1.66T.
2. produce the method for the fine magnetic property non-oriented electrical steel of Rm >=600MPa claimed in claim 1, its step:
1) smelt also continuous casting and become base;
2) to the continuously cast bloom heating, temperature is not less than 1050 ℃, and time inside furnace is not less than 120 minutes;
3) carry out hot rolling: control the roughing finishing temperature and be not less than 900 ℃, steel plate thickness is not less than 25mm; Control the finish rolling finishing temperature and be not less than 750 ℃, thickness of slab is not less than 2.0mm;
4) batched, control coiling temperature and be not less than 700 ℃;
5) carry out normalizing, control the normalizing furnace soaking temperature and be not less than 750 ℃, the normalizing time is no less than 1 minute;
6) carry out pickling cold rolling: pickling temperature 60-100 ℃, pickling time 2 ~ 5 minutes, adopt the once cold rolling method to carry out cold rolling, and rolling pass is 4 ~ 7, and the total reduction of controlling front 3 ~ 6 passages is not less than 80%, and extreme trace time draft is no more than 20%;
7) carry out continuous annealing, annealing temperature is not less than 850 ℃, and soaking time is no less than 1 minute, and atmosphere is conventional H
2+ N
2gas mixture, N
2/ H
2be no more than 0.5, gas flow is not less than 200m
3/ min;
8) naturally cool to room temperature, stand-by.
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Cited By (7)
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| WO2018179871A1 (en) * | 2017-03-30 | 2018-10-04 | Ｊｆｅスチール株式会社 | Method for manufacturing non-oriented electromagnetic steel plate, method for manufacturing motor core, and motor core |
| CN109067107A (en) * | 2018-08-27 | 2018-12-21 | 武汉钢铁有限公司 | A kind of preparation method of high-performance high-speed permanent magnetic synchronous motor iron core |
| WO2020166718A1 (en) * | 2019-02-14 | 2020-08-20 | 日本製鉄株式会社 | Non-oriented electromagnetic steel sheet |
| WO2021037061A1 (en) * | 2019-08-26 | 2021-03-04 | 宝山钢铁股份有限公司 | 600mpa grade non-oriented electrical steel sheet and manufacturing method thereof |
| US11404189B2 (en) | 2017-05-31 | 2022-08-02 | Jfe Steel Corporation | Non-oriented electrical steel sheet and method for manufacturing the same |
| US11525169B2 (en) | 2018-10-31 | 2022-12-13 | Jfe Steel Corporation | Non-oriented electrical steel sheet and method for producing same, and motor core and method for producing same |
| WO2024022109A1 (en) * | 2022-07-29 | 2024-02-01 | 宝山钢铁股份有限公司 | Non-oriented electrical steel sheet having high magnetic flux density, and manufacturing method therefor |
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| JPWO2018179871A1 (en) * | 2017-03-30 | 2019-07-11 | Ｊｆｅスチール株式会社 | Method of manufacturing non-oriented electrical steel sheet, method of manufacturing motor core, and motor core |
| WO2018179871A1 (en) * | 2017-03-30 | 2018-10-04 | Ｊｆｅスチール株式会社 | Method for manufacturing non-oriented electromagnetic steel plate, method for manufacturing motor core, and motor core |
| US11404189B2 (en) | 2017-05-31 | 2022-08-02 | Jfe Steel Corporation | Non-oriented electrical steel sheet and method for manufacturing the same |
| CN109067107A (en) * | 2018-08-27 | 2018-12-21 | 武汉钢铁有限公司 | A kind of preparation method of high-performance high-speed permanent magnetic synchronous motor iron core |
| US11718891B2 (en) | 2018-10-31 | 2023-08-08 | Jfe Steel Corporation | Non-oriented electrical steel sheet and method for producing same, and motor core and method for producing same |
| US11525169B2 (en) | 2018-10-31 | 2022-12-13 | Jfe Steel Corporation | Non-oriented electrical steel sheet and method for producing same, and motor core and method for producing same |
| CN113474472A (en) * | 2019-02-14 | 2021-10-01 | 日本制铁株式会社 | Non-oriented electromagnetic steel sheet |
| JPWO2020166718A1 (en) * | 2019-02-14 | 2021-10-21 | 日本製鉄株式会社 | Non-oriented electrical steel sheet |
| JP7180700B2 (en) | 2019-02-14 | 2022-11-30 | 日本製鉄株式会社 | Non-oriented electrical steel sheet |
| WO2020166718A1 (en) * | 2019-02-14 | 2020-08-20 | 日本製鉄株式会社 | Non-oriented electromagnetic steel sheet |
| CN113474472B (en) * | 2019-02-14 | 2023-09-26 | 日本制铁株式会社 | Non-oriented electromagnetic steel sheet |
| WO2021037061A1 (en) * | 2019-08-26 | 2021-03-04 | 宝山钢铁股份有限公司 | 600mpa grade non-oriented electrical steel sheet and manufacturing method thereof |
| JP2022545027A (en) * | 2019-08-26 | 2022-10-24 | バオシャン アイアン アンド スティール カンパニー リミテッド | 600MPa class non-oriented electrical steel sheet and manufacturing method thereof |
| JP7462737B2 (en) | 2019-08-26 | 2024-04-05 | バオシャン アイアン アンド スティール カンパニー リミテッド | 600MPa-class non-oriented electrical steel sheet and its manufacturing method |
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